Examples with Journal com.android.launcher3.backup.BackupProtos.Journal used on opensource projects

Example 6 with Journal

use of com.android.launcher3.backup.BackupProtos.Journal in project Launcher3 by chislon.

the class LauncherBackupHelper method performBackup.

/**
 * Back up launcher data so we can restore the user's state on a new device.
 *
 * <P>The journal is a timestamp and a list of keys that were saved as of that time.
 *
 * <P>Keys may come back in any order, so each key/value is one complete row of the database.
 *
 * @param oldState notes from the last backup
 * @param data incremental key/value pairs to persist off-device
 * @param newState notes for the next backup
 * @throws IOException
 */
@Override
public void performBackup(ParcelFileDescriptor oldState, BackupDataOutput data, ParcelFileDescriptor newState) {
    Log.v(TAG, "onBackup");
    Journal in = readJournal(oldState);
    Journal out = new Journal();
    long lastBackupTime = in.t;
    out.t = System.currentTimeMillis();
    out.rows = 0;
    out.bytes = 0;
    Log.v(TAG, "lastBackupTime=" + lastBackupTime);
    ArrayList<Key> keys = new ArrayList<Key>();
    try {
        backupFavorites(in, data, out, keys);
        backupScreens(in, data, out, keys);
        backupIcons(in, data, out, keys);
        backupWidgets(in, data, out, keys);
    } catch (IOException e) {
        Log.e(TAG, "launcher backup has failed", e);
    }
    out.key = keys.toArray(BackupProtos.Key.emptyArray());
    writeJournal(newState, out);
    Log.v(TAG, "onBackup: wrote " + out.bytes + "b in " + out.rows + " rows.");
}

Example 7 with Journal

use of com.android.launcher3.backup.BackupProtos.Journal in project Launcher3 by chislon.

the class LauncherBackupHelper method backupFavorites.

/**
 * Write all modified favorites to the data stream.
 *
 * @param in notes from last backup
 * @param data output stream for key/value pairs
 * @param out notes about this backup
 * @param keys keys to mark as clean in the notes for next backup
 * @throws IOException
 */
private void backupFavorites(Journal in, BackupDataOutput data, Journal out, ArrayList<Key> keys) throws IOException {
    // read the old ID set
    Set<String> savedIds = getSavedIdsByType(Key.FAVORITE, in);
    if (DEBUG)
        Log.d(TAG, "favorite savedIds.size()=" + savedIds.size());
    // persist things that have changed since the last backup
    ContentResolver cr = mContext.getContentResolver();
    Cursor cursor = cr.query(Favorites.CONTENT_URI, FAVORITE_PROJECTION, null, null, null);
    Set<String> currentIds = new HashSet<String>(cursor.getCount());
    try {
        cursor.moveToPosition(-1);
        while (cursor.moveToNext()) {
            final long id = cursor.getLong(ID_INDEX);
            final long updateTime = cursor.getLong(ID_MODIFIED);
            Key key = getKey(Key.FAVORITE, id);
            keys.add(key);
            currentIds.add(keyToBackupKey(key));
            if (updateTime > in.t) {
                byte[] blob = packFavorite(cursor);
                writeRowToBackup(key, blob, out, data);
            }
        }
    } finally {
        cursor.close();
    }
    if (DEBUG)
        Log.d(TAG, "favorite currentIds.size()=" + currentIds.size());
    // these IDs must have been deleted
    savedIds.removeAll(currentIds);
    out.rows += removeDeletedKeysFromBackup(savedIds, data);
}